Solar energy is a renewable energy source which have tremendous potential in compensating the short fall due to more demand in electrical energy drawn from non renewable energy sources such as fossil fuels , coal , petroleum , hydropower plant generations and nuclear power plant. It also reduce environment pollution and noise. Fabrication of fundamental unit (solar cell) has undergone number of improvements from first generation (silicon based vapour solar cell) to another generation in order to achieve low cost and high efficiency as possible. An photovoltaic installation in electrical system is cheapest way to produce electricity from solar energy. This review paper also tries to emphasizes the various practices to promote the benefits of solar energy.